There are two things I see wrong with your HSPICE s-parameter setup.
First you are trying to compute s-parameters for a current. This
doesn't make sense. You know by definition that the current is really
your (voltage) s-parameters divided by the port impedance which you have chosen
to be 50 ohms. Secondly, the port 2 should be left as a high impedance
to ground whereas you have a voltage source at port 2. To satisfy
HSPICE that doesn't like floating nodes I will typically tie a 100K
resistor from port 2 to ground. The HSPICE s-parameter (.net statement)
automatically assumes that 'rout=50' is your port 2 impedance.

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